I found this ((as part of a more severe problem which WAS fixed))
in ``old closed tasks'' a while ago..
It still _is_ a (minor) problem, i.e. an R<-->S inconsistency
##- TASK: Name Attributes on Calls
##- STATUS: Closed
##- FROM: <p.dalgaard@kubism.ku.dk>
##- A call with tagged arguments is something like a list, the tags
##- can be used to access elements, but the names attribute is absent,
##- until the call is coerced to a list. (Attempting to set the names()
##- causes evaluation. Changing "list" to "blipblop" causes
an 'Error:
##- couldn't find function "blipblop"' at that point.)
print(j <- substitute(list(a=1, b=2)))## list(a = 1, b = 2)
mode(j); is.call(j)# "call" , TRUE
j$b## [1] 2
names(j)# [1] "" "a" "b"
names(j) <- NULL ; j #-- doesn't do anything in R -- but does in S-plus
## S: list(1, 2)
## R-0.50-a2 and R-0.50-a4 :
## list(a = 1, b = 2)
mode(j)#> [1] "call"
names(j)# S: NULL; R: "" "a" "b"
names(j) <- c("", "CC", "DD"); j #-- this DOES
work ...
names(j) <- c("", "", ""); j #-- this DOES work
...
names(j) <- c("blipblop", "x", "y"); j# no
change to 'list' [[same for R and S]]
## list(x = 1, y = 2)
names(j) # [[same for R and S]]:
## [1] "blipblop" "x" "y"
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-r-devel
mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To:
r-devel-request@stat.math.ethz.ch
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
